Sucker rod fishing tool



Aug. 2, 1932. w. A. oBANNoN 1,869,861

' sucKER Ron FISHING TooL Filed March 9, 1951 Patented Aug. 2, 1932 WALTER A. OBANNON, OF TULSA, OKLAHOMA PATENT orric SUCKER RODI FISHING TOOL Application le'd March 9,

This invention relates to fishing tools of the overshot, type for use in recovery of lost sucker rods, pipes and othersimilar parts from deep wells, the tool being designed to telescope over the part left inthe well and firmly interlock therewith Ytopermit Withdrawal thereof from the well by the tool.

More specifically, my invention relates to tools especially designedv for engagement l0 with the rod joint boxes or couplings. These boxes or couplings are usually especially tempered or hardened and for this reason preclude the use of the gripping type of sucker rod socket since the jaws vthereof cannot be made to engage satisfactorily the hardened surface for withdrawal purposes.

An object of my invention is, therefore, to provide a sucker rodfishing tool adapted to engage the-hardened joint section or box of the rod to permit the same to be vposi'- tively interlocked with theV tool for withdrawal purposes.-v

Another object of my invention is to provide a socket wherein the lower part of the rod box is arranged to be positively' supported by the fishing tool during the withdrawal from the well.

A further object is to provide a fishing` tool which is formed with a supporting shoulderV adjacent to the entrance and a slidable detent arranged to move under the lower portion of thebox after the box has passed into the tool and cooperate with the sup-V porting shoulder and the lower portion of the box and positively interlock the tool with the rod for withdrawing purposes.

Other' and further objects and advantages of the invention will be hereinafter set forth and the novel features thereof defined by the 0 appended claims.

Fig. 1 is a longitudinal sectional view through a fishing tool constructed in accordance with my invention, the head being shown in elevation; f 1

Fig. 2 is an enlarged longitudinal, fragmentary, sectional viewlof the box sho-wing the relative position of the parts when the tool is being telescoped over a sucker vrod socket box; and

Fig. 3 is a view similar to Fig 2, showing 1931. Serial N0. 521,332.

the box fully telescoped within the tool and the parts in interlocked or lifting position. Like reference numerals refer to like parts in the several figures of the drawing in which 1 indcates the body or barrel of the fishing 55 tool, being threaded at one end at2 to'receive the supporting head 3. The head is provided with a threaded portion4 for attachment to the usual sucker rod or supporting cable (not shown). The body 1 is formed at the other 60 endwith an inwardly flared sucker rod vbox receiving opening 5 and a circular restricted bore 6 of substantially the diameter of the sucker rod box 7 as seen in Fig. 2. The bore 6 extends inwardly forfa short 65 distance and terminates in the outwardly and downwardly inclined supportingl shoulder 8. The Ainternal bore 'of the barrel from this shoulder is-increased, as indicated at 9, and extends upwardly tothe second in- 7 clinedvshoulder or tapered portion 10 which Y inclines upwardly and outwardly to the main bore 11 of thebarrel'. The barrel is preferably vented at 12 to permit discharge of 'anydirt or mud contained therein during the 75 fishing operation. l v

Slidably disposed within the barrel 1 is the detent member 13 which is formed at one end with an annular, inwardly extending flange 14 arranged to support the'comp'res- 80 sion vspring 15. The ldetent member 13 is slitvlongitudinally of its length at a plurality of points, such as indicated'at 16, to provide detent fingers 17. The lower end of the detent-member 13, before the slitting operation, is formed with an annular constricted'opening or bore 18, the diameter of which is lessl .than the diameter of the box 7 which is to be engaged. From this point, the .bore 18 tapers upwardly and'outwardly to the main cylindrical bore 19 of the detent member, the tapered portion being indicated atv20 and con-v stituting a supporting shoulder for the box of the sucker rod after the same has beeninserted into the main cylindrical bore 19. The entrance portion of the restricted opening 18 of the detent. member is 'tapered outwardly and downwardly, as indicated at 21 and 22, the external diameter of the detent member being substantially the same as "the internal bore 9 so as to permit the tapered portion 22 to cooperate with the supporting shoulder 8, as seen in Figs. 1 and 3, the portion of the detent member 13 between the supporting shoulder 2O and the inclined shoulders 22 and 21 constituting detents 23 after the detent member 13 has been slit, as indicated at 16.

The parts of the device are normally in the position shown in Fig. 1 of the drawing, the detent member being forced downwardly into cooperative position with respect to the intermediate bore 9 and the supporting shoulder 8, the compression spring 15 being utilized for this purpose. i

The socket is attached to the usual lowering means, such as a sucker rod, and is lowered into the Well for the fishing operation.

The continued lowering action will cause the flanged opening 5 of the barrel to guide the box 7 of the sucker rod into the restricted bore 6, andupon engagement of the end of the box 7 with the tapered or beveled portion 21 of the detents 23, moves them upwardly into the enlarged bore 11 of the barrel. When the detents 23 reach this enlarged portion, they will be cammed outwardly, as shown in Fig. 2.of the drawing, to permit the box to pass through the opening o-r bore 18 formed by the detents 23. v

After the box '7 has passed beyond the detents 23, they will be released and permitted to spring back to their normal position, as shown in Figs. 1 and 3, the spring 15 forcing the detent member 13 downwardly into the intermediate bore 9. Under these conditions, itwill be observed that the detents 23 will be supported against longitudinal movement by the shoulder 22 and against lateral movement by the wall forming the bore 9, and since the diameter of the bore 18 is less than the diameter of the box 7, the box will be fully supported, as shown in Fig. 3, by the shoulders 2O of the detents.

Since the weight of the rod istransmitted substantially downwardly through the detents 23 upon the shoulder 8 of the barrel, there is no tendency for the excessive weight of the sucker rod to expand or cause distortion of the detent member or the end of the barrel. Y

The detent member is preferably formed of resilient material, such as tempered steel, so as to spring back into its contracted position, as shown in Fig. 3, after the box has passed into the internal bore thereof.

In order to remove the box from the socket after the rod has been withdrawn from the Well, it is only necessary to move the detent member 13 upwardly with respect to the barrel to the position shown in Fig. 2 and support the same in this position, whereupon the engagement of the shoulder 24e at the lower end of the box with the shoulders 2O of the detents will cause them to be moved outwardly into their released position, as seen in Fig. 2 of the drawing.

While the specific details of construction have been herein shown and described, the invention is not confined thereto as changes and alterations may be made without departing from the spirit 'thereof as defined by the appended claims.

Having thus described my invention, what claim as new and desire to secure by Letters Patent is t* 1. A sucker rod fishing tool comprising a barrel, a lifting detent movably mounted therein and exp ansible in said barrel to receive a sucker rod, said detent having internal shoulder engaging means at one end to engage beneath a shoulder yon the rod, said barrel being provided with an internal supporting stop to receive the end of the detent when the latter has contracted into the engaging relation aforesaid.

2. A sucker rod fishing tool comprising a barrel, and a lifting detent movably mounted therein and expansible when moved upwardly in said barrel to receive a sucker rod, said detent being provided with resilient contractable fingers having shoulders thereon to engage beneath a shoulder on th-e rod to be lifted, said barrel being provided with. an internal supporting stop shoulder to receive the end of the detent when the latter has contracted into the engaging relation aforesaid.

3. In a sucker rod fishing tool comprising a barrel, a cylindrical lifting detent movably mounted therein, said detent being split longitudinally to provide resilient contractable detent fingers having internal shoulder engaging means at one end to engage beneath a shoulder on the sucker rod when in contracted position. said barrel being provided with a supporting stop shoulder to receive the end of the detent lingers when the latter hav-e contracted into the' aforesaid rod engaging relation.

li. In a sucker rod fishing tool comprising a barrel, a cylindrical lifting detent movably mounted therein7 said detent being split longitudinally to provide resilient contractable detent fingers having internal shoulder cngaging means at one end to engage beneath a shoulder on the sucker rod when in contracted position, said barrel being provided with a supporting stop shoulder to receive the end 0f the detent fingers when the latter have contracted into. the aforesaid rod engaging relation, and means on the barrel for locking the detent fingers in contracted position when in engagement with the supporting stop shoulder aforesaid.

5. In a sucker rod fishing tool, a barrel having a restricted bore lat one end, a lifting detent movably mounted in the barrel and expansible to receive a sucker rod, said detent having internal shoulder engaging means at one end to engage beneath a shoulder on the rod, said restricted bore of the barrel thereof, and means on the detent for engaging being provided With internal supporting stop a shoulder on the rod coupling vvh'en 1n conmeans to engage with the detent when the tracted posltlon to constitute lifting means latter has been contracted into the aforesaid OI the SllCkeI' IOdrelation with respect to the rod, means to move the detent into engagement with the stop `means aforesaid, and means on the barrel for locking the detent in contracted position when in engagement with said stop shoulder.

6. In a sucker rod fishing tool, a barrel, a i

cylindrical lifting detent movably mounted "therein, said detent having resilient fingers forming internal shoulder engaging means arranged to engage a shoulder on the rod to be lifted, said fingers being expansible Within the barrel to receive a sucker rod and resiliently contractable to engage the shoulder laforesaid on the rod, said barrel being provided With an internal detent supporting stop shoulder to engage the detent fingers when in contracted position, and means on the barrel to lock the detent fingers in said Contracted position when engaged With the supporting stop shoulder aforesaid.

7. In a sucker rod fishing tool, a barrel, a lifting detent movably mounted Within the barrel, said detent being formed with resilient detent fingershaving internal shoulder engaging means arranged to engage beneath a shoulder on the sucker rod to be lifted, said detent being movable upwardly in the barrel to permit the fingers to expand to allow the rod to be lifted to be received in the barrel, said barrel being formed with a restricted opening, a detent supporting shoulder adiacent to the openingto support the detent fingers when in contracted position, and means Within the barrel for moving the detent lingers into the supporting position aforesaid.

8. In a fishing tool for sucker rods. a barrel, a cylindrical lifting detent mounted for longitudinal movement Within the barrel, said detent being formed kat one end With an annular internal shoulder, the detent being slit longitudinally from the said end to provide a plurality of resilient detent fingers which are expansible When the detent is moved to one position in the barrel to per-V mit the sucker rod to be passed into the detent, and means on the barrel for preventing outward longitudinal or lateral movement of the detent ngers When'the detent is moved to another position in the body.

9. In a fishing tool for sucker rod cou- Y plings, a barrel,an expansible lifting detent movably mounted Within the barrel and shiftable in one positiontherein to permit the passage of `a sucker rod coupling therethrough, a supporting stop shoulder on the barrel for engagement With the detent when in operative position to prevent longitudinal movement thereof, means on the barrel for engagement With the eXpansible detent When in Voperative position to prevent expansionv In testimony Whereof affix my signature.

WALTER A. OBANNON. 

